Cutoff saw with line-of-cut indicator



y 1, 1 50 J. M. HUMPHREY 2,515,008

CUTOFF SAW WITH LINE-OF-CUT INDICATOR Filed Jan. 26, 1946 3 Sheets-Sheet 1 iiiiiiiifiiiifif:Tfffffffj g I lllllll|f lll|ll /n van for i 2 James M Humphrey 'fi By W Afforney July 11, 1950 J. M. HUMPHREY 2,515,008

CUTOFF SAW WITH LINE-OF-CUT INDICATOR Filed Jan. 26, 1946 3 Sheets-Sheet 2 y 1950 J. M. HUMPHREY 2,515,003

CUTOFF SAW WITH LINE-OF-CUT INDICATOR Filed Jan. 26, 1946 3 Sheets-Sheet 3 Li 5 34 76 7e James M. Humphrey By Attorney Patented July 11, 1950 CUTOFF SAWWITH LINE-OF-CUT INDICATOR James M. ;Humphrey',..New Richmond, Wis, as-

signor, by zme'sne assignments, of ninety .per cent to Doughboy industries, Inc., New Richmond, Wis., a corporationof Wisconsin Application Januar-yBG, 1946, Serial'No.643,632

Claims.

fLhe present invention :relates to improvements in tcuteofiisaws of the type wherein a c'iroular saw is causedto travel through the work piece which is held in stationary position and more particularly is concerned with portable cut-01f :saws.

An objector the invention is-to provide a device which is extremely light :in weight, in expensive in cost and maintenance but which will perform with the same :e'fficiency, whether on light or on heavy work, as the ordinary heavy and overpowered machines commonly employed in production shops.

'It is a further object of the invention to "provide a device which is adapted to cut all degrees of angle very simply without the necessary reference to adjustable guides or clamps.

Another object of the invention is to provide ade'v'ice havin'g'means for maintaining the work table and traveling saw in constant alignment, which "means is capable of adjustment to compensate for wear or accident.

Other and further advantages of -the invention will become apparent from the following detailed explanation taken in 'conjun'ctionwith the accompanying drawings wherein a preferred embodiment of the principles of the "invention has been selected for 'exempiification.

the drawings:

Figure '1 is-a, p1an'viewo'f a portab1e cut-off saw embodying features of the present invention;

Fig. "2, a fragmentary plan view showing the indicator blade in operative position;

3, a fragmentary plan view showin the work guide in operative position;

'4, a side levati'onal view of the device illustrated in plan in Fig. 1';

Fig. a 'front elevational view of the device in Fig. 4;

Fig. '6, a top plan'view of the device shown in Figs. 4 and 5 but with the saw -table removed;

Fig. '7, 'afragmentar-y section taken' on l ine 'l---! of 'Fig. 6;

Fig. 8,a fragmentary-section taken on lined- 8 of Fig. 6;

Fig.9, 'a'fragmenta'ry section'taken on line 99 of Eig. 6; and

Fig. 10, :a fragmentary section taken :lin-e l0--I:D "of :Fig. 4.

.Referring more particularly :to the drawings, wherein like numerals :refer to alike parts, a saw or work table il fl :constructed of any suitable, preferably light-weight, material is provided with an elongated slot 12 through which the traveling circular saw I4 projects.

art the reward end or the saw table .agraduated squaring :guide it is removably secured to the table M! .in any suitable manner such as by threaded screws. A support I8 is carried by the squaring guide It proximate to the extended end thereof :for the purpose of supporting long pieces of lumber in the manner indicated in Fig. 1.

An indicator blade 20 whose function will be hereinafter more particularly described is pivotally mounted :at the forward end oi the table l0 -.on.a short shaft 22 rotatably mounted in end bearings 24 and having stop collars 26 adjacent its opposite ends. The table It is further provided with a work guide 23 attached to the table by means of bolts and wing nuts 30 which are slidabl'e in. slots 32 to adjust the work guide in operative position, such 'as is shown in Fig. 3.

A housing 'or guard 34 is removably secured to the table It! at the remote extremity of the siot I! for receiving the saw 14 when in normal or inoperative position. Table iii further carries at the forward and rearward ends of its under surface L-frame members 36 and 38, respectively, which may be secured in any suitable manner as shown.

The frame or supporting structure for the saw table rand saw carriage is composed of four upright tubular members 4'0 connected by upper transverse cross members 12 and bylower cross braces '44 a'tthe forward and rearward ends of the device. A bracing member 45 extends between the cross braces 34 intermediate the ends thereof. Thepair of upright members 40 at the rear of the device have mounted at their lower extremities rubber wheels 58 journaled in housings '58. The lower extremities of the forward pair of tubular members Ml are preferably extended to rest directly upon the floor so as to support the saW table normally in horizontal position. A pair of inverted V-shapedtracks 52 extends longthwise of the frame structure and are secured by any suitable means such as welding to the upper pair of cross members 42.

The table M3 is adapted to be hingedlymounted upon the 'frame structure and to this end ears 54 are secured to the under surface of the table preferably by welding to -L-frame member 38. Ears 54 are hinged to rod 56 which extends transversely of the frame and is supported on the frame by upstanding .l-ugs 58 which in turn are welded to cross member --42 at the rear of the frame.

A pair of rigid studs 60 maybesecured, such as by-we'ldingto the frame 36 carried by the forward end :of table Ml, these :studs beingeng-ageable respectively in 'a pair of elongated :apertures 05,

provided in a cross frame member 62 (Figs. 6 and '7 which is welded or otherwise suitably secured to tracks 52. These studs and apertures are so related as to bring the table I into alignment with the saw I4 and, when adjustably secured by lock nuts64 and wing nuts 66, are

adapted to compensate for any wear or accident,

The saw carriage is movably supported on tracks 52 and is composed of a pair of longitu-J dinal upper straps 63 secured at opposite ends to shafts 1B which rotatably support carriage rollers.

12 provided with grooved peripheral surfaces mating substantially with the angular tracks 52.

The carriage further is composed of a'pair of transversely extending straps 14 connected by cross braces 16. The extremities of straps M the left hand side of the saw and the waste to be cut off is at the right hand side of the saw, the shaft 22 is moved to its extreme rightward position. The indicator blade thus makes possible the cutting of all angles, rapid duplication of angles, rapid duplication of-an ang1e on a piece already cut 'and many other applications which will become apparent to the operator.

Work guide 28 may be employed in conjunction with or independently of indicator blade by adjustment of wing nuts 3i] so as to support the work in any desired angular relationship with respect to the saw 94, such for example as is illustrated in Fig. 3.-

are extended laterally to underlie tracks 52 to prevent any upward displacement of the carriage.

Depending from the upper portion of the carriage structure are motor hangers 18 which carry at their lower extremities an adjustable platform 80 upon which an electric motor 82 is mounted. A V-shaped belt pulley 84 connects the drive shaft of motor 82 with the saw arbor 85 journaled at the upper portion of the carriage. Secured also to the upper portion of the carriage in a position adjacent to the saw I4 is a shield or a guard 88.

1 Longitudinal travel of the carriage is limited forwardly by cross frame member 62 and rearwardlyby stop members 63, likewise Welded or otherwise suitably secured to tracks 52.

A pull handle is secured to the carriage whereby to control its movement along supporting tracks This operating handle is preferably composed of a horizontal tubular portion 90 welded or otherwise suitably secured to the carriage at one end and carrying at its other end a collar 92 L-shaped in cross section which is adapted adjustably to receive the shank of tubular member 94 which extends above the saw table within reach of the operator.

The device herein illustrated and above de- 1 scribed is extremely simple in operation. The hollow tubular supports and angle irons impart a minimum of weight so that the device may be tilted and easily wheeled to any desired location and an adequate degree of rigidity and durability during sawing operations.

Cut-off saws heretofore have been highly unsuited for the cutting of angles of any degree. The indicator blade 28 obviates this objection in the present invention. In cutting angles with the herein described device it is only necessary to make a fine pencil mark on the work piece, then to lay the piece upon the saw table and swing the blade 28 upwardly and over the work piece. The pencil mark is then carefully lined up with the guide edge of the indicator blade to position the piece accurately with respect to the cutting path of the saw. With the work piece held by the hand of the operator in this position the blade at may then be raised and lowered to its I normal position at the front of the machine and waste to be cut off is at the left hand side of the saw, the shaft 22 will be moved to its extreme leftward position. When the work piece is on The graduated squaring guide it permits the cutting of lumber of any length within the ca- .pacity of the guide without other measurement, and the support 58 as shown in Fig. 1 which prevents the cut-ofr piece from falling to the floor nary purposes the motor 82 may be a, one-half horsepower electric motor and the saw M in the neighborhood of 8 inches in diameter.

2%, inches in thickness in a single pass.

It will be understood that the herein invention v is not limited to the particular construction specifically shown and described but is capable of such interchange, omission, and addition of elements and any other modification as may come within the scope of the following claims.

What is claimed is:-

1. A cut-off saw comprising in combination av portable'frame structure, a saw table hingedly supported upon said frame structure, transverse. cross members carried one each at the forward and rearward ends of said frame structure, a pair of inverted V-shaped rails secured to 'saidcross members and extending longitudinally of said frame structure, a traveling circular saw carriage having peripherally grooved rollers in engagement withsaid rails to support said carriage upon and for longitudinal movement along said rails, means carried by the forward and rearward ends of said rails and engageable with said travel-.

ing saw to limit its longitudinal movement, laterally projecting means secured to said carriageand engageable with the undersurface of said rails to prevent upward displacement of said carriage, stud means fixed to said hinged saw table and extending through enlarged apertures in the frame structure, means for releasably securing said studs in said apertures whereby the align:-,

ment of the saw table with respect to said circular saw may be adjusted, an indicator blade pivotally mounted upon said saw table swingable into and out of position over the work piece to indicate the line of cut thereon and shiftable laterally into different positions according to the side of e the saw receiving the work piece and a pull handle removably secured to said carriage and extendingabove said saw table for passing said saw across.

the Work piece.

2. A cut-.offsaw comprising incombination iaf Such a construction is adapted .to cut lumber up to about portable frame'structure, a saw table hingedly supported upon said frame structure, a traveling saw carriage including a circular saw carried by said frame structure, studs fixed to said saw table and extending through enlarged apertures in said frame structure, means for releasably securing said studs in said apertures whereby the alignment of said saw table with respect to said saw may be adjusted, an indicator blade adjustably pivoted to said frame structure and movable into and out of position over a work piece with an edge thereof in substantial alignment with the cutting path of the traveling saw to indicate the line of out upon the work piece and an adjustable pull handle secured to said carriage and extending above the saw table for passing said saw across the work.

3. A cut-off" saw comprising in combination a portable frame structure, a saw table hingedly supported upon said frame structure, a traveling saw carriage including a circular saw carried by trackways on said frame structure, studs fixed to said saw table and extending through enlarged apertures in said frame structure, means for releasably securing said studs in said apertures whereby the alignment of said saw table with respect to said saw may be adjusted; and means projecting from said carriage for moving said saw carriage.

4. A cut-off saw comprising in combination a portable frame structure, a saw table hingedly supported upon said frame structure, a traveling saw carriage including a circular saw carried by said frame structure, studs fixed to said saw table and extending through enlarged apertures in said frame structure, means for releasably securing said studs in said apertures whereby the alignment of said saw table with respect to said saw may be adjusted, an indicator blade adjustably pivoted to said frame structure and movable into and out of position over a work piece with an edge thereof in substantial alignment with the cutting path of the traveling saw to indicate the line of out upon the work piece and an adjustable pull handle secured to said carriage and extending above the saw table for passing said saw across the work piece.

5. A cut-off saw comprising in combination a portable frame structure, a saw table supported upon said frame structure, a traveling saw carriage including a saw carried by said frame structure, an adjustable indicator blade pivotally mounted on said saw table and having a guide edge movable into and out of position above the saw table and on the work piece with said guide edge in alignment with the cutting path of the saw to indicate the line of out upon the work piece and means for moving said saw carriage.

6. In combination with a saw table including a saw movable in a predetermined path from a retracted position to a cutting position and adapted to receive a work piece, an indicator blade pivotally secured to said table and movable into and out of position over said work piece and in contact therewith, the end of said blade being spaced from said saw when said saw is in retracted position, with an edge of said indicator blade in such position in substantial alignment with said path whereby to indicate the line of out upon the work piece.

7. In combination with a saw table adapted to receive a work piece and including a, saw movable in a predetermined path from a retracted position to a cutting position to cut the work piece, an indicator blade pivotally secured to said table, said indicator blade being movable into and out of position over said Work piece and in contact therewith whereby to indicate the line of out upon the work piece, the end of said blade being spaced from said saw when said saw is in retracted position, said blade being shiftable laterally into different positions according to the side of the saw receiving the work piece.

JAMES M. HUMPHREY.

REFERENCES CITED The following references are of record in the file of this patent:

UMTED STATES PATENTS Number Name Date 176,531 Hoffman Apr. 25, 1876 428,773 Ham May 27, 1890 752,701 Norlin Feb. 23, 1904 881,064 Favreau Mar. 3, 1908 1,618,341 Howland Feb. 22, 1927 1,763,473 Palmeter June 10, 1930 1,792,955 Willis Feb. 17, 1931 1,793,392 Francyk Feb. 17, 1931 1,825,104 Staeheli Sept. 29, 1931 1,960,590 McKay May 29, 1934 2,247,314 Sellmeyer June 24, 1941 2,307,820 Butters Jan. 12, 1943 2,310,813 Sellmeyer Feb. 9, 1943 2,396,961 Meredith Mar. 19, 1946 FOREIGN PATENTS Number Country Date Great Britain Jan. 3, 1899 of 1399 120,047 Switzerland May 2, 1927 645,577 Germany June 1, 1937 

